Personally, I tend to look for someone "at" an address (the address names a place or location, and I go there) rather than "with" an address (I have the address with me like a tool that I use, analogous to a pencil or notebook). Saying "at" an address in Spanish would use a different preposition than "con".

I would suggest "sentían." You probably chose the present-tense to suggest that the attraction between A. and R. is not something that later ended (although it began in the past,) but the imperfect can convey this. Preterite-over and done. Imperfect- began in the past, may (or may not) be continuing in the present.

Edit: Oops, just noticed this thread is 2 months old. The assignment must have long since been turned in!